package com.cy.store.controller;

import com.cy.store.service.ex.*;
import com.cy.store.util.JsonResult;
import org.springframework.web.bind.annotation.ExceptionHandler;

import javax.servlet.http.HttpSession;

/**
 * 控制层类的基类
 */
public class BaseController {
    //操作成功的状态码
    public static final int OK = 200;


    //请求处理方法，这个方法的返回值就是需要传递给前端的数据
    //自动将异常对象传递给此方法的参数列表上
    //当项目中产生异常，被统一拦截到此方法中，这个方法就充当的是请求处理方法，方法的返回值直接给到前端
    @ExceptionHandler(ServiceException.class) //用于统一处理抛出的异常
    public JsonResult<Void> handleException(Throwable e){
        JsonResult<Void> result = new JsonResult<>(e);

        if (e instanceof UsernameDuplicatedException){
            result.setState(4000);
            result.setMessage("用户名已经被占用");
        }else if (e instanceof AddressNotFoundException){
            result.setState(4004);
            result.setMessage("用户收货地址不存在的异常");
        }else if (e instanceof AccessDeniedException){
            result.setState(4004);
            result.setMessage("收货地址非法访问");
        }else if (e instanceof CartNotFoundException){
            result.setState(4007);
            result.setMessage("购物车数据不存在异常");
        }else if (e instanceof UserNotFoundException){
            result.setState(5001);
            result.setMessage("用户数据不存在异常");
        }else if (e instanceof PasswordNotMatchException){
            result.setState(5002);
            result.setMessage("用户密码错误异常");
        }else if (e instanceof AddressCountLimitException){
            result.setState(4003);
            result.setMessage("用户地址超过上限异常");
        }else if (e instanceof InsertEception){
            result.setState(5000);
            result.setMessage("插入数据时产生未知异常");
        }else if (e instanceof UpdateException){
            result.setState(5001);
            result.setMessage("更新数据时产生未知异常");
        }else if (e instanceof DeleteException){
            result.setState(5002);
            result.setMessage("删除数据时产生未知异常");
        }
        return result;
    }

    /**
     * 获取session中的uid
     * @param session session对象
     * @return 当前登录用户的uid
     */
    protected final Integer getUidFromSession(HttpSession session){
        return Integer.valueOf(session.getAttribute("uid").toString());
    }

    /**
     * 获取当前session的username
     * @param session
     * @return
     */
    protected final String getUsernameFromSession(HttpSession session){
        return session.getAttribute("username").toString();
    }


}
